Greetings, hoping someone might be able to share some insight please, have a 2004 Toyota Hilux 3.0 Tdi 1kz-te with a issue where it is not sending the signal to open the spill valve, if we earth the spill valve we get the vehicle to start, can anyone advice what circuit needs to be checked on the ecu please? No ecu fault codes, tried another working diesel pump, same thing...

Regards,
Jasson